Re: [PATCH v2] eal: fix DMA mask validation inconsistency in IOVA VA

[Thomas Monjalon <thomas@monjalon.net>]

18/09/2025 09:55, Shani Peretz:
> From: Shani Peretz <shperetz@nvidia.com>
> > 
> > When --iova-mode is explicitly specified in command line, DMA mask
> > constraints were not being validated, leading to potential runtime failures
> > when device DMA capabilities are exceeded.
> > 
> > The issue occurred because rte_bus_get_iommu_class() was only called during
> > IOVA mode auto-detection, but this function has the important side effect of
> > triggering DMA mask detection (e.g., Intel IOMMU address width checking via
> > pci_device_iommu_support_va()).
> > 
> > This created an inconsistency, when choosing explicit mode, the DMA checks
> > are bypassed, but when choosing auto-detection mode, the constraints are
> > checked and enforced.
> > 
> > The fix moves rte_bus_get_iommu_class() outside the conditional logic to
> > ensure it's always called during EAL initialization.
> > 
> > Fixes: 4374ebc24bc1 ("malloc: modify error message for DMA mask check")
> > Cc: stable@dpdk.org
> > 
> > Signed-off-by: Shani Peretz <shperetz@nvidia.com>
> 
> Rebased on latest main. Patch was already acked
> 
> Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>

Applied, thanks.